Lorna Arte is a centaur attendant serving Tisalia Scythia at Scythia Transportation. A war orphan adopted by the Arte family during the human-monster conflict, she grew up alongside her adoptive sister Kay Arte and Tisalia's helpers. Physically, Lorna possesses purple hair and turquoise eyes, matching Kay's height but without her sister's low ponytail. Her attire features light armor in white, black, and pink with red accents, worn over a puffy-sleeved shirt and a light pink skirt longer than Kay's. This armor includes a plated rear section, a frontal accessory over the skirt, and a saddle-like feature on her back.

Personality-wise, Lorna exhibits strength and reliability in her duties supporting Tisalia, yet contends with deep-seated self-esteem issues and inner loneliness. These vulnerabilities become pronounced during Kay's absence, as seen when Kay's injury in a rockslide triggered Lorna's clumsiness, absentmindedness, and emotional distress, leading to errors like fetching incorrect clothing, mishandling Tisalia's hair, and cutting her finger while preparing food. Symptoms subsided only after medical intervention restored her stability. Lorna also displays an amorous side, teasing Glenn about marrying Tisalia and engaging in playful acts like blowing into his ear. Her anxiety is managed through a unique medical treatment involving bondage, which calms her by removing her sense of control and improving concentration.

Lorna shares a deeply loyal bond with Tisalia, serving her with unwavering dedication. Her connection to Kay is equally profound and mutually dependent; Lorna's functionality significantly declines when separated from her sister, underscoring their emotional interdependence. Both sisters actively support Tisalia's romantic pursuits and maintain a strong sisterly dynamic. As a centaur, Lorna wields considerable physical strength, particularly in her legs, enabling her to pull chariots and move at high speeds.